期刊
ELECTROCHIMICA ACTA
卷 267, 期 -, 页码 161-169出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.02.080
关键词
Nanocomposites; Alpha-nickel hydroxide; RGO; Iron phthalocyanine; Electrocatalysis; Oxygen evolution reaction
资金
- Fundacao de Amparo Pesquisa do Estado de Sao Paulo (FAPESP)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [CNPq 402281/2013-6, 306504-2011-1, FAPESP 2015/20776-9]
- fellowship (CNPq) [141853/2015-8]
- fellowship (CAPES)
The effect of size and degree of crystallinity, and the synergic interaction of alpha-Ni(OH)(2) nanoparticles (alpha-Ni) with reduced graphene oxide (rGO) and octacarboxyphthalocyaninate iron(II) (FeOCPc), on the electrocatalytic activity for the oxygen evolution reaction (OER) are demonstrated using structurally well-defined nanocomposite materials. Larger and crystalline alpha-Ni@ rGO-K nanoparticles (4.7 +/- 1.8 nm) generated materials with higher activity than the respective alpha-Ni(OH)(2)-Na derivatives (1.8 +/- 0.3 nm), where the incorporation of rGO improved dramatically the performance. However, an even larger efficiency was achieved when alpha-Ni@ rGO-K was covered up with a controlled amount of FeOCPc, a poor molecular OER catalyst, in this way demonstrating a synergic effect of that macrocycle on the reaction kinetics decreasing further the overpotential of the oxygen evolution reaction. In fact, alpha-NiFeOCPc@rGO-K was the ternary composite material with best performance, being able to sustain a stable current of 10 mA cm(-2) during 8 h of continuous electrolysis at 1.64 V vs RHE, in 1.0 mol dm(-3) KOH solution, showing good perspectives as electrode material for OER. (C) 2018 Elsevier Ltd. All rights reserved.
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